@unpublished{repository53346,
       publisher = {Universitas Muhammadiyah Prof. DR. HAMKA},
            note = {Unpublished},
           title = {Surat Tugas, Undangan dan Sertifikat Seminar Nasional},
             url = {http://repository.uhamka.ac.id/id/eprint/53346/},
          author = {fetrimen, fetrimen}
}